Sounds to me like pleurisy, Capt'n... In other words, pain on the chest wall... Ya' see you have this stuff that lubricates your lungs and keeps you breathing normal... When you get inflammation in there it's painful...

Sometimes people also have little air sacks in the outside of the lungs called "blebs" that will pop and cause pain, too...

If the heart is fine then it's more than likely one of those two common and benign conditions...

It will pass quickly...

Now if it gets worse and nothing relieves it you may be having a spontaneous phenom-thorax (collapsed lung) which could require a chest tube and a couple days flirting with nurses...

BTW, I've had all three and have several blebs which can be seen on x-rays... No biggie...

Half a pint of Scotch and you'll be good as new...

B~